Last month, Zynga’s CEO and founder Mark Pincus stepped aside as the company’s top executive in favor of Don Mattrick, the former president of Interactive Entertainment Business at Microsoft. (Pincus still remains as chairman of Zynga.) On Tuesday, however, Mattrick decided to restructure the top ranks.

According to a Wall Street Journal report citing anonymous sources, “Chief Operating Officer David Ko, Chief People Officer Colleen McCreary, and Chief Technology Officer Cadir Lee will step down from their positions and leave the company.” The paper said that Mattrick was expected to make a formal announcement later in the day.

Kelly Kunz, a Zynga spokesperson, declined to comment to Ars.

In a conference call with investors earlier this month, Mattrick indicated that there were changes afoot.

“Over the course of the next few months I will be working with our leadership team to challenge previous assumptions and to focus on business fundamentals, which, candidly, we’ve struggled with over the past year,” he said. “We anticipate two to four quarters of volatility as we work through resetting and developing our strategy for growing topline revenue and profit. I’ll be detailing more of this in coming calls and look forward to keeping you up to date on our progress. Getting a business back on track isn’t easy and isn’t quick. We have a lot of hard work in front of us, but I believe we can succeed as a team and Zynga can do this.”

As we reported earlier, the once top-dog has gone through a bit of a rough patch over the last year. In the summer of 2012, the company quickly lost a bunch of executives and managers. That October, the company announced that it overpaid for OMGPOP (maker of Draw Something). Then Pincus was ousted and the company suddenly shut down OMGPOP as well.